Registers – Platform operated – Platform actuated traffic counters
Patent
1977-04-28
1978-11-28
Thesz, Joseph M.
Registers
Platform operated
Platform actuated traffic counters
235 92CA, 235 92V, 235 92R, 235 98C, 340674, G07C 900
Patent
active
041277660
ABSTRACT:
Disclosed is an apparatus for determining the number of moving objects which completely traverse a given path. The apparatus provides an array of light sensors which are placed adjacent the path. A scanner periodically samples the output of each sensor in the array and produces an output proportional to the ambient light in the path striking the sensor. This output is stored for comparison with future outputs so that changes in the ambient light in the path may be detected. Changes in ambient light at a particular sensor are compared with changes detected by adjacent sensors, first to prevent erroneous readouts and second to determine the direction of movement. Moving objects completely traversing the field are recorded.
REFERENCES:
patent: 3036219 (1962-05-01), Thompson
patent: 3378675 (1968-04-01), Cromley
patent: 3692980 (1972-09-01), Getker et al.
patent: 3727034 (1973-04-01), Pope
patent: 3808410 (1974-04-01), Schlesinger
patent: 3840868 (1974-10-01), Campman
patent: 3970846 (1976-07-01), Schofield
patent: 4000400 (1976-12-01), Elder
patent: 4009389 (1977-02-01), Lindholm
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